Antenna base



FIG. 1 is a right front perspective view of an antenna base showing our new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a right side elevational view thereof.

FIG. 5 is a left side elevational view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings illustrate portions of the antenna base which form no part of the claimed design. 

CLAIM The ornamental design for an antenna base, as shown and described. 